package com.bdqn.t382.practice;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

public class LoggingInvocationHandler implements InvocationHandler {
    private final Object target;

    public LoggingInvocationHandler(Object target) {
         this.target = target;
         }
    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        // 获取实现类中的方法信息
        Method methodTarget = target.getClass().getMethod(method.getName());
        // 判断方法上面是否有 Log 注解
        if (methodTarget.isAnnotationPresent(Log.class)) {
            String methodName = method.getName();
            DateTimeFormatter formatter = DateTimeFormatter
                    .ofPattern("yyyy-MM-dd HH:mm:ss.SSS");
            LocalDateTime startTime = LocalDateTime.now();

            System.out.println("[LOG] Method: " + methodName + " started at: "
                    + startTime.format(formatter));

            Object result = method.invoke(target, args);
            LocalDateTime endTime = LocalDateTime.now();
            long duration = java.time.Duration.between(startTime, endTime).toMillis();

            System.out.println("[LOG] Method: " + methodName + " ended at: "
                    + endTime.format(formatter));
            System.out.println("[LOG] Method: " + methodName
                    + " executed in: " + duration + "ms");
            return result;
        } else {
            return method.invoke(target, args);
        }
    }
}
